Take A and B cards and place them above the LCD of the machine, and test 3 times each at short distance (0CM) → long distance (4CM) and short distance (0CM). After the test is passed, press the "Cancel" button to enter the LCD and backlight test.
Take A, B card, placed on top of the machine liquid crystal, close (0CM) → distance (4CM) close (0CM) each test 3 times. After passing the test, press the "Cancel" key to enter the LCD and backlight test.
Take a and B cards and place them on the top of the liquid crystal of the machine, and test three times from close distance (0cm) → long distance (4cm) short distance (0cm). After passing the test, press the "Cancel" key to enter the LCD and backlight test.<br>